Volumetric combustible gas liquefying device utilizing compression-expansion refrigeration and using method thereof

Abstract

The invention discloses a volumetric combustible gas liquefying device utilizing compression-expansion refrigeration and a using method thereof. A refrigerant purifying pretreatment unit, a refrigerant compression unit, a multi-stream heat exchanger and a refrigerant expansion unit are sequentially connected end to end through inlets and outlets to form a refrigerant loop; a combustible gas purifying pre-treatment unit, a multi-stream heat exchanger and a combustible gas storage tank are sequentially connected end to end through inlets and outlets to form a combustible gas liquefying loop; the refrigerant compression unit is formed by connecting a plurality of refrigerant compressors; an oil cooling circulating loop is arranged on each refrigerant compressor; the refrigerant expansion unit is formed by connecting a plurality of expanders; and an oil lubricating circulating loop is arranged on each expander. The volumetric combustible gas liquefying device disclosed by the invention can realize liquefying of combustible gas, can be used for liquefying a great deal of combustible gas resources which are stored in conventional or unconventional natural gas fields in remote areas of China, so that transportation cost is reduced; and primary energy sources are sufficiently utilized, so that air environmental pollution caused by direct combustion or emission at present is reduced.

Description

technical field [0001] The invention relates to the technical field of energy saving and environmental protection, in particular to a volumetric compression expansion refrigeration combustible gas liquefaction device and its use method, which utilizes the refrigerant compression and precooling expansion process to provide cooling capacity for combustible gas liquefaction and to recover useful resources and the purpose of energy saving and emission reduction. Background technique [0002] In my country's energy consumption structure, coal accounts for 70.4%, while oil and natural gas account for only 19.7% and 3.3% respectively. difference. my country's coal-based energy consumption structure (technical equipment, energy policies, etc. are all based on coal) has led to serious environmental pollution, severe acid rain in some areas, and frequent occurrence of haze weather (especially in the northern heating season). Threats to human health, but also a great threat to the sust...

AI Technical Summary

Problems solved by technology

The cascaded natural gas liquefaction process is relatively complicated, with a lot of equipment, it is difficult to meet the requirements of small-scale skid-mounted, and due to the inconvenience of maintenance, this liquefaction process is rarely used at present

Mixed refrigerant The ratio of mixed refrigerant in the natural gas liquefaction process is related to the pressure and composition of the raw gas. It will also have a greater impact on the composition of the mixed refrigerant

Images